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Edelbrock Performer RPM Top End Kit for 1961–1965 Chevy W‑Series 409 V‑8 engines. Tested at 451 HP and 474 lb-ft on a 409 ci W‑Series with 9.0:1 compression, it improves street power from about 1,500–6,500 rpm. The single-box kit includes an RPM Air‑Gap intake, RPM cylinder heads, pushrods, Rollin' Thunder hydraulic roller camshaft, timing chain, bolt kits and an Edelbrock gasket set to simplify parts matching.
Edelbrock Power Package Top End Kit Performer RPM 348-409 BB Chevy W-Series V8 450+ Hp
